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Raman scattering spectra enable molecular “fingerprinting”, which is of particular interest for molecular sensing and bio-applications. Surface enhanced Raman scattering (SERS) provides greater detection sensitivity than conventional Raman spectroscopy, and it is quickly gaining traction in the study of biological molecules adsorbed on a metal surface. SERS spectroscopy allows for the detection...
The dispersion relations of multilayer dye-doped hyperbolic metamaterials (HMM) are studied. We show that metallic losses can be greatly compensated by saturated gain. Two realizable applications using gain-assisted HMMs, namely hypergratings and epsilon-near-zero materials, are proposed.
We demonstrate a method to fabricate ultra-thin ultra-smooth and low-loss silver and silver-silica composite films using a germanium wetting layer and a rapid post-annealing treatment. Such achievement satisfies both the demands for superlenses and hyperlenses.
Plasmonic filters were fabricated based on gold fractal nanostructures grown on silica microspheres. The fractal nanostructures were modified using laser irradiation, resulting in decreased extinction in the mid-infrared range.
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